user_pref("full-screen-api.warning.timeout",               0); //disable full screen warning message
user_pref("browser.fullscreen.animateUp",                "0"); //disable fullscreen animation
user_pref("full-screen-api.transition-duration.leave", "0 0");
user_pref("full-screen-api.transition-duration.enter", "0 0");
user_pref("toolkit.cosmeticAnimations.enabled",        false); 
user_pref("browser.compactmode.show",                   true); //enable compact modus
user_pref("browser.backspace_action",                    "0"); //enable backspace for 'page back', default = 2
user_pref("browser.aboutConfig.showWarning",           false); //disabe about:config-warning
user_pref("browser.tabs.closeWindowWithLastTab",       false); //don't quit browser while close last tab.
user_pref("pdfjs.disabled",                            false); //keep internal pdf reader
user_pref("browser.startup.homepage",          "about:blank"); //no startup page